$\sin\left(a-b\right)-\sin\left(a+b\right)$
$-\sqrt{20}$
$\int a^udu$
$64^2-100$
$a\left(b+a\right)=a\left(b\right)+a\left(c\right)$
$3\left(x-5\right)^2=3x\left(x+5\right)-15$
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